CHM1020 Week 3

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South College *

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1020

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Chemistry

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Jan 9, 2024

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Name:____ _______________________________CHM 1020 W3 Week 3 Assignment 1. Classify each example of molecular art as a compound or element. Moreover, where applicable, specify which of the species are molecules. A. Compound B. Element C. Compound D. Compound E. Compound F. Element 2. In the image below, for each ion, identify the net charge: a. 56-54 = +2 b. 15-18 = -3 3. Using the figure on the following page on how to achieve an octet for cations and anions, please draw a Lewis dot structure for each of the following elements. Also, identify what net charge each element would adopt to achieve the valence electron configuration of a noble gas ( achieve a stable octet ). ***See Lithium below as an example. a. Example: Li Lewis Structure:  Li + where it has 1+ net charge b. F F -1 c. Mg Mg +2 d. Cl Cl -1 e. K K +1 f. S S -2 g. Ca Ca +2 Page 1 of 5

Name:____ _______________________________CHM 1020 W3 4. Balancing charges: Suppose that X represents an arbitrary cation and that Y represents an anionic species. Using the charges indicate in the superscript of X and Y, fill in the remaining spaces below by writing the appropriate subscript for each X and Y species to balance the net charge on the ionic X a Y b compound formed (where a and b represent whole numbers of X and Y, respectively): Y - Y 2- Y 3- X + XY X 2 Y X 3 Y X 2+ XY 2 XY X 3 Y 2 X 3+ XY 3 X 2 Y 3 XY Page 2 of 5

Name:____ _______________________________CHM 1020 W3 5. Next, similar to the table above, write the formula of the ionic compound formed from each pair of cations and anions shown below ( see Aluminum sulfite as an example below ): Br - OH - HCO 3 - SO 3 2- PO 4 3- Na + NaBr NaOH NaHCO 3 Na 2 SO 3 Na 3 PO 4 Ca 2+ CaBr 2 Ca(OH ) 2 Ca(HCO 3 ) 2 CaSO 3 Ca 3 (PO 4 ) 2 Al 3+ AlBr 3 Al(OH ) 3 Al(HCO 3 ) 3 Al 2 (SO 3 ) 3 Al(PO 4 ) 6. Using the table below (list of anions), write out the name of each of the following compounds: a. Na 2 CO 3 – Sodium Carbonate b. Ca(OH) 2 – Calcium Hydroxide c. Mg(NO 3 ) 2 –Magnesium Nitrate d. Mn(CH 3 CO 2 ) 2 – Manganese Acetate e. Mg 3 (PO 4 ) 2 – Magnesium Phosphate Page 3 of 5

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Name:____ _______________________________CHM 1020 W3 7. Using the table above (list of anions), write down the correct chemical formula for the following compounds: a. Sodium bicarbonate – NaHCO 3 b. Ammonium Sulfate – (NH 4 ) 2 SO 4 c. Magnesium Phosphate – Mg 3 (PO 4 ) 2 d. Calcium bisulfate – Ca(HSO 4 ) 2 e. Potassium hydroxide – KOH 8. Using the table below (naming of metals) write out the name of each transition-metal containing compound (note: please see your SmartBook/e-text in the CHM 1010 course if you need a reference for ionic compound naming): a. Fe 2 O 3 – Ferric oxide b. Fe(HSO 3 ) 2 – Ferrous hydrogen sulfite c. SnF 4 – Stannic fluoride d. Cu 2 O – Cuprous oxide Page 4 of 5

Name:____ _______________________________CHM 1020 W3 9. Here are examples of common over-the-counter medicines whose active ingredient(s) is/are ionic compounds. Write down the correct chemical name of its active ingredient and identify the ions formed (including charge) when that ionic compound is added to water (or in your stomach). a. Medicine Name: Milk of Magnesia Ionic Compound/Active Ingredient: Magnesium Hydroxide Cation and Charge: Mg 2+ Anion and Charge: OH - b. Medicine Name: Antacid “Tums” Ionic Compound/Active Ingredient: Calcium Carbonate Cation and Charge: Ca 2+ Anion and Charge: CO 3 2- c. Medicine Name: Fer-In-Sol or Feratab Ionic Compound/Active Ingredient: Ferrous Sulphate Cation and Charge:Fe 2+ Anion and Charge: SO 4 2- Page 5 of 5